Automatic transmitter for telegraphic systems.



No. 835,751. PATB-NTBD NOV. 13, 1906.

J. GELL1 AUTOMATIC TRANSMITTER FOR, TEL EGR'APHIG vSYSTEMS.

APPLICATION FILED SEPT. 29, 1905.

rus NoRRls #:rsas ,c c.

UNITED STATES PATENT oEEroE.

JOHN GELL, OF LONDON, ENGLAND.

AUTOMATIC TRANSMITTER FOR TELEGRAPH'IC SYSTEMS.

Specification of Letters Patent.

Patented Nov. 13, 1906.

Application filed September 29, 1905. Serial No, 280.653.

To all "whom it may concern:

Be it known that I, JOHN GELL, a subject of the King of Great Britain,and a resident of London, England, have invented certain new and usefulImprovements in Automatic Transmitters for Telegraphic Systems, of whichthe following is a specification.

My present invention relates to the form of apparatus disclosed by me inan application for Letters Patent of the United States, filed November28, 1904, Serial No. 234,620. In said apparatus a perforated tape is fedby a star feed-wheel to present its perforations .to transmitting-pinsadapted to rise vertically through said perforations, the pins beingconnected with levers controlling electrical contacts and operated uponby cams which depress the levers and then allow them to be subjected tothe lifting power of springs, so that if at this time there is aperforation in the tape opposite the end of either transmitting-pin thecorresponding contact-lever will be raised to the appropriate electricalcircuit, and thus give the electrical impulse; but if there is noperforation in the tape over the transmitting-pin when it rises the saidpin in its upward movement will be arrested by the imperforate portionof the tape and this will prevent the lever from closing its contact,and no electrical impulse will result.

The object of my present invention is to provide an arrangement fordouble current working, only one battery being used and two connectionsbeing broken at proper times.

I have also in my present invention provided an improved form of checkfoot or shoe under which the perforated tape passes to act inconjunction with the transmittingpins.

The invention consists in the features and combination and arrangementof parts hereinafter described, and particularly pointed out in theclaims.

In the accompanying drawings, Figure 1 is a side view of the invention,partly in section and partly in the nature of a diagram. Fig. 2 is asectional view in a plane at right angles to the plane of Fig. 1. Fig. 3is a detail sectional view of the improved check-foot. Fig. 4 is a frontview, and Fig. 5 a bottom plan view of the same.

In Fig. 1 only one of the contact-levers appears, it being understoodthat the other lever is immediately back of and in the same plane withthe lever shown, so that it is hidmitting-pin connected with den fromview. The same is true of the transmitting-pins. The transmitting-pin ismarked a and the lever b. The transmitting-pin is connected to the leverat c, and said lever is pivoted at d. The cam or segment-wheel foroperating the levers is shown at e.

The lever companion to the one shown in Fig. 1 is represented in sectionin Fig. 2 and is marked b. The contacts or anvils carried by the leversare marked 1 and 2, respectively, and their corresponding contacts 1 and2 In this present form of my invention for double-current working I addtwo supplemental contacts in the form of angle-levers 3 3 which by theforce of springs 4 follow up the anvil-contacts 1 and 2 until theirupper parts nearly touch the contact-screws 1 2 the amount of travelbeing-limited by the stop-screws 5.

The anvil 1 is connected to earth through the plug 6, shown forconvenience diagrammatically; but in reality this is arranged like theplug 6 in Fig. 2 and alongside the same. The anvil-contact 2 isconnected to line through the contact-plug 6 A single battery isemployed, the carbon-terminal being connected with the plug 7, whichholds the contact-screws 1 2 The zinc terminal of this battery isconnected to the plug 8, to which is pivoted the angle-levers 3 3 Theaction of the double-current apparatus just described is as follows:When the transthe inner key or lever b rises through a hole in the tape,the an ill 2 makes contact with the screw 2 and breaks contact with theangle-lever 3*. The

current from the copper pole of battery passes through 7, 2 2, and 6 toline, and the zinc current passes at the same time through 8 8angle-lever 3, contact 1, and plug 6 to earth, the imperforate part ofthe tape having held the transmitting-pin a down together with its leverand the contact between 3 and 1 being thereby maintained. By thisarrangement anvils 2 and 1 are continually in contact with 3 X and 3when the imperforate portions of the tape goes through. The frequentconnection of the line and earth resulting from this arrangementfacilitates the line discharging to earth frequently, and by the use ofpro perly-shaped earns the line can be made to momentarily discharge toearth between each signal. This facilitates clear and rapid signalingunder certain conditions. When the outer transmitting-pin a risesthrough a hole 1 of a pair of main contacts connected respecin the tape,contact is made through 1 and 1 l tively to earth and line, movablecarrier and broken between 1 and 3 and maintained broken between 2 and 2and in contact between 2 and 3*. The Zinc current flows through 8, 8 32, and 6 to line and the means for said contacts, means controlled bythe passage of the tape for controlling the contact-carriers, a battery,a pair of supplemental contacts to coact with the mainconcoppercurrentthrough 7,1 ,1,and6to earth. 1 tacts and arrangedbetween the main con- Figs. 3, 4, and 5 show my preferred form ofcheck-shoe. This shoe has a groove 9 for the star feed-wheel to work andtwo saw-cuts 10 for the transmitting-pins, which cuts reaching out tothe edge expose the pins to view and facilitate accurate adjustment andthe clearance of the fiufi from the edges of the holes in the paperinstead of allowing this waste to work down into the mechanism.

In order to start a piece of tape in the middle, it is necessary toraise the shoe in order to adjust the tape over the star feed-wheel tothe proper point. For this purpose an eccentric 11 is used, moving in aslot 12. When turned by the handle 13, the eccentric will turn to raiseand lower the check-shoe. The shoe moves in side guides 14. In Fig. 3the shoe is shown in its upper position. 15 is a spring to keep the shoeagainst the side of the machine. The advantage of this arrangement isthat the shoe is firmly or rigidly held in all of its adjusted positionsto take up the upward thrust exerted through the transmittingpins andthe tape.

I claim as my invention 1. In an automatic telegraphic instrument, thecombination of a battery, two transmitting-pins, a star feedwheel,levers controlled by the said pins, a cam device also controlling thelevers, contacts carried by the levers, a pair of supplemental contactsfor double-current working arranged between the contacts on the leversand one pole of the battery,

connections from the contacts of the levers to the earth and linerespectively and a pair of contacts to be engaged b y the lever-contactsand connected to the other pole of the battery, substantially asdescribed.

2. In an automatic telegraphic instrument employing a perforated tape,the combination tacts and one pole of the battery and a pair of lcontacts to coact with the main contacts and j connected to the otherpole of the battery, 1 substantially as described.

3. In an automatic telegraphic instrument, the combination of a pair ofmain contacts connected respectively to earth and line, movable carriermeans for said contacts, means controlled by the passage of the tape forcontrolling the contact-carriers, a battery, a pair of supplementalcontacts to coact with the main contacts and arranged between the maincontacts and one pole of the battery and a pair of contacts to coactwith the main contacts and connected to the other pole of the battery,said supplemental contacts being movable to follow up the movement ofthe main contacts and to be stopped while the main contact continues itsmovement, substantially as described.

4. In combination with the star feed-wheel, transmitting-pins, acheck-shoe an eccentric for elevating the check-shoe and a spring forapplying tension to the parts whereby the check-shoe will be maintainedat different elevations to which it maybe raised by the eccentric,substantially as described.

5. In an apparatus of the class described, and in combination with thestar feed-wheel and transmitting-pins, a check-shoe having a groove forthe star feed-wheel and open notches for the transmitting-pins,substantially as described.

In testimony whereof I aflix my signature 1 in presence of twowitnesses.

l JOI-IN GELL.

Witnesses:

H. D. JAMEsoN, F. L. RAND.

